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Question

A certain pale-green substance A becomes dark brown on adding NaNO2 in presence of dilute H2SO4. Its aqueous solution gives precipitates with BaCl2 and NaOH in separate tests. The latter precipitate B gradually changes colour from green to brown on exposure to air. What is A?

A
NiSO4
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B
FeSO4
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C
CuSO4
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D
Cr2(SO4)3
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Solution

The correct option is B FeSO4
A is FeSO4,
Reactions:
FeSO4+BaCl2BaSO4
white ppt.
FeSO4+NaOHFe(OH)2
white ppt.

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